What Is an Oxygen Lance?

Cutting torch qin Gas cutting tool with a valve, shaped like a gun, with a nozzle at the front end. Also called cutting torch.

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Cutting torch qin Gas cutting tool with a valve, shaped like a gun, with a nozzle at the front end. Also known as

"Cut gun" is

1. Theme content and scope of application ^[2]

This standard specifies the operating procedures for manual gas cutting workpieces

This standard applies to gas cutting of our factory's system components

2. Reference standards

YB / JQ101.10 General technical conditions for machine repair and manufacture of iron and steel enterprises

3. Preparation

3.1 Familiar with drawings and process files, and understand the material, specifications and tolerance requirements of the workpiece in detail.

3.2 Install the cutting torch on the fixed hose joint, check whether the oxygen meter and acetylene safety pot are working properly and whether the torch firing suction is good.

3.3 When using an oxygen cylinder, the bottle should be stabilized and deflated to blow off the dust and debris at the joint, and then install the oxygen meter. When the air pressure inside the bottle is lower than the working pressure, it must be replaced, and the gas bottle should be moved to avoid collision, and oil is strictly prohibited.

3.4 When using a temporary acetylene generator, pay attention to:

3.4.1 The acetylene generator must be 10 meters away from the source, more than 3 meters away from the oxygen cylinder, and 1 meter away from the heating equipment.

3.4.2 Sufficient clean water shall be maintained in the generator, and the water seal and tempering preventer shall maintain a certain water level.

3.4.3 The amount of calcium carbide added in the generator should be specified according to the amount of calcium carbide added at one time. The calcium carbide block should meet the requirements, generally 50-80mm.

3.5 When using liquefied petroleum gas, the ambient temperature must not exceed 60oC, and the cylinder should be more than 5 meters away from the fire source.

3.6 Check the workpiece against the drawing. The unevenness of gas-cut steel plates shall meet the requirements. Generally, the unevenness of steel plates with a thickness less than 14 mm is 2/1000, and the unevenness of steel plates with a thickness greater than 14 mm is 1/1000.

3.7 Clean up the site, flatten the workpiece, and leave a gap of not less than 100 mm for the bottom of the board, and remove rust, oil, etc. in the range of 30-50 mm on both sides of the slit of the workpiece.

3.8 Prepare various auxiliary tools. For gas cutting of non-ferrous metals and special steels, a flux must be prepared.

4. Gas cutting

4.1 Select the cutting nozzle according to the thickness of the steel plate, and adjust the process specifications according to the regulations (Table 1)

4.2 Check the cutting oxygen flow line. The streamline should be a straight and clear cylinder. If the streamline is irregular, close all valves to trim the cutting nozzle.

4.3 The gas cutting workpiece adopts an oxidizing flame, and the size of the flame should be appropriately adjusted according to the thickness of the workpiece.

4.4 During gas cutting, the cutting nozzle is aligned with one end of the gas cutting line to heat the workpiece to a molten state, and a fast wind is opened to fully burn the metal. After the workpiece is burned through, the cutting nozzle is moved along the gas cutting line.

4.5 The cutting should be started in the middle of the steel plate. If the circle is cut, the hole should be cut in the steel plate first. If the steel plate is thicker, the hole can be drilled first, and then the cutting can be started from the hole.

4.6 Gas cutting sheet, the cutting nozzle cannot be perpendicular to the workpiece, it needs to be deflected by 5-10 degrees, the flame energy rate should be small, and the gas cutting speed should be fast.

4.7 Gas cutting thick plate, the cutting nozzle is perpendicular to the workpiece, 3-5mm from the surface. After cutting, the cutting nozzle is inclined 5-10 degrees in the opposite direction to the cutting direction, so that the slit is neat when finishing.

4.8 Use a tug to cut the arc. The cutting torch should not be raised too high, especially when cutting small arc thick plates, the cutting torch should be parallel to the workpiece.

4.9 Needles should be used to dredge the cutting nozzle during work. The cutting nozzle should be immersed in water for cooling if it is overheated.

4.10 Gas cutting special steel, according to process requirements.

5. After the gas cutting, remove the slag and inspect the workpiece.